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利用Thermecmastor-Z热模拟试验机,得到了Fe16 Mn0.6C TWIP钢在变形温度850~1 150℃,应变速率0.03~30 s-1条件下热压缩变形的真应力应变曲线。进而研究了变形温度、应变速率对Fe16 Mn0.6C钢流变应力和临界动态再结晶行为的影响规律。结果表明,850~1 150℃范围内Fe16 Mn0.6C钢热变形的峰值应力随温度的升高而降低,随着应变速率的增大而升高;且在应变速率为0.03 s-1和30 s-1出现明显的应力峰值,材料发生了动态再结晶。最后采用线性回归方法计算出Fe16 Mn0.6C钢的高温变形流变应力本构方程,得出热变形激活能为469 kJ/mol;并通过应变硬化速率与流变应力曲线求出了该钢种动态再结晶临界条件与Z参数之间的关系。
With the Thermecmastor-Z thermal simulator, the true stress-strain curve of Fe16Mn0.6C TWIP steel under hot deformation at strain of 850-1 150 ℃ and strain rate of 0.03-30 s-1 was obtained. Then the effect of deformation temperature and strain rate on the flow stress and critical dynamic recrystallization behavior of Fe16 Mn0.6C steel was studied. The results show that the peak stress of Fe16 Mn0.6C steel decreases with the increase of temperature and increases with the increase of strain rate in the range of 850-1 150 ℃. When the strain rate is 0.03 s-1 and 30 s-1 apparent stress peak, the material underwent dynamic recrystallization. Finally, using the linear regression method, the constitutive equation of high temperature deformation flow stress of Fe16 Mn0.6C steel was calculated, and the activation energy of thermal deformation was 469 kJ / mol. Through the strain hardening rate and the flow stress curve, The relationship between dynamic recrystallization critical conditions and Z parameters.